This is designed after the famous and hard to find mil-spec M855 Steel core. Green Tip. It is loaded to NATO specs and is NOT intended for use in commercial or bolt-action rifles chambered in 223 Remington ammo, but is perfect for your AR15 in 5.56 cal. Please check with your gun manufacturer prior to purchasing this ammo. Each round is brass-cased, boxer-primed, non-corrosive, and reloadable. It is both economical and precision manufactured in the Untied States.